Show HN: Hone for iPhone 4S - never lose your keys again

Hone is a Bluetooth low energy device for the iPhone 4S and new iPad that erases the annoyance of losing your keys - my partner (Louis Gerbarg) and I built it for ourselves, and then decided to put it on Kickstarter. It lasts for 6+ months on a CR2032 battery, has a 50 meter range, and we're making the whole thing in the USA - case, PCB, and component assembly. We've gotten lots of help and support from HN users (esp. Eric Migicovsky's Solid State Hardware talk, curtgeen's hardware design guide) and we'd love feedback now that we're launching.